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relay to turn on car stereo

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=99909
Printed Date: June 23, 2025 at 12:49 PM


Topic: relay to turn on car stereo

Posted By: madrigal87
Subject: relay to turn on car stereo
Date Posted: December 11, 2007 at 9:08 PM

I heard that you can turn on you car stereo with you car alarm with a relay

Does any one know how?




Replies:

Posted By: the12volt
Date Posted: December 11, 2007 at 9:43 PM

Replace the switch lead (green) shown below with a negative output from your alarm.

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https://www.the12volt.com/relays/page5.asp#lsp



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posted_image the12volt • Support the12volt.com



Posted By: madrigal87
Date Posted: December 12, 2007 at 8:46 PM

I Heard you can turn on your car stereo with your car alarm

What is that devices in the picture is it a lighter? where do a get 12 volt output or where do i connect it to?

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Posted By: mobile1
Date Posted: December 14, 2007 at 9:20 PM
The "lighter" is just a momentary switch. You wouldn't use this. You would hook the light green wire up to the aux output from your alarm.  The 12v+ output would be the wire you hook up to your accy wire from your radio.



Posted By: sik_integra
Date Posted: January 24, 2008 at 4:48 AM
Hey Im really keen to do this.. Ive made my head deck so it doesnt turn off wen i take the key out cuz its wired striaght to the 12volt but i want to make it so I can turn it off and on from the Alarm remote can someone please tell me how to? thanks.



Posted By: hotwaterwizard
Date Posted: January 30, 2008 at 10:00 PM
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !



Posted By: hotwaterwizard
Date Posted: January 30, 2008 at 10:02 PM
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !



Posted By: hotwaterwizard
Date Posted: January 30, 2008 at 10:17 PM
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !



Posted By: tedmond
Date Posted: February 01, 2008 at 7:01 AM
you can do what hotwater showed you, or if your unit offers LATCHED output for the aux, you can wire that to a relay and use the relay to power your audio system, but it will strain your battery.


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